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A decomposition method of vortex identification and its application in side channel pumps

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Abstract

This research utilizes the Ω vortex identification method to address the turbulent flows in a single-stage side channel pump, to comprehensively characterize the three types of dynamic vortex structures classified based on directions. Premised on the Galilean invariance, the work employs coordinate rotation and transformation. Thus, the indistinguishable 3-D vortex can be simplified to 2-D vortex on typical research planes. When juxtaposing the overall performance, it was revealed that a diversity of areas with high values yielded enhanced reflection of the vortex intensity, as measured by velocity distribution. The axial vortex structure with high intensity exists at the outer radius under all conditions largely. While the longitudinal vortex usually shows high intensity between the middle and outer radius. Simultaneously, the radial vortex is more likely to be at the inner radius near the suction face. Finally, this paper introduces a specific value ξ, which represents the ratio of decomposition to the total of the manifestation of the fluid rotational pattern. From the fluctuation and mean value, it can be realized that the development of the specific vortex in three directions at different positions. For example, the specific value ξ2 refers to the typical longitudinal vortex as dynamic vortex are almost from 20% to 50%, which illustrates that the longitudinal vortex only occupies a minor percentage in the total vortex. This phenomenon is one of the main reasons for the low efficiency. The present work could provide some suggestions and references for in-depth studies in fluid engineering with intense swirling flows.

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Acknowledgments

The authors express their sincere gratitude to Prof. Martin Böhle of the SAM in the Technical University of Kaiserslautern, Germany for his great support in this work. This work was supported by the Ranking the Top of the List for Science and Technology Projects of Yunnan Province (Grant No. 202204BW050001), the Taizhou Science and Technology Project (Grant Nos. 21gyb05, 21gyb08) and the Research Innovation Program for College Graduates of Jiangsu Province (Grant No. KYCX22_3641). The authors also gratefully acknowledge financial support from China Scholarship Council.

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Authors and Affiliations

  1. National Research Center of Pumps, Jiangsu University, Zhenjiang, 212013, China

    Ke Chen, Fan Zhang, Desmond Appiah & Shou-qi Yuan

  2. Quality Inspection Center for Pump Products in Zhejiang Province, Wenling, 317599, China

    Yu-jian Fang

  3. College of Mechanical and Power Engineering, China Three Gorges University, Yi Chang, 443000, China

    Feng Hong

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  1. Ke Chen
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  2. Fan Zhang
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  3. Yu-jian Fang
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  4. Desmond Appiah
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  5. Shou-qi Yuan
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  6. Feng Hong
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Corresponding author

Correspondence to Fan Zhang.

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Ethical approval: This article does not contain any studies with human participants or animals performed by any of the authors.

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Conflict of Interest: The authors declare that they have no conflict of interest.

Informed consent: Informed consent was obtained from all individual participants included in the study.

Project supported by the National Natural Science Foundation of China (Grant Nos. 52279086, 52150410397).

Biography: Ke Chen (1996-), Male, Ph. D. Candidate

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Chen, K., Zhang, F., Fang, Yj. et al. A decomposition method of vortex identification and its application in side channel pumps. J Hydrodyn 34, 1106–1120 (2022). https://doi.org/10.1007/s42241-022-0082-8

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  • DOI: https://doi.org/10.1007/s42241-022-0082-8

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